861471087 has 4 divisors (see below), whose sum is σ = 1148628120. Its totient is φ = 574314056.

The previous prime is 861471067. The next prime is 861471109. The reversal of 861471087 is 780174168.

It is a happy number.

861471087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861471087 - 2¹⁴ = 861454703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861471007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143578512 + ... + 143578517.

It is an arithmetic number, because the mean of its divisors is an integer number (287157030).

Almost surely, 2^861471087 is an apocalyptic number.

861471087 is a deficient number, since it is larger than the sum of its proper divisors (287157033).

861471087 is a wasteful number, since it uses less digits than its factorization.

861471087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287157032.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 861471087 is about 29350.8277055350. The cubic root of 861471087 is about 951.5104639980.

The spelling of 861471087 in words is "eight hundred sixty-one million, four hundred seventy-one thousand, eighty-seven".